v3.26.3
INVESTMENT SECURITIES (Summary of Investment Securities) (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Amortized cost    
Available-for-sale $ 10,349 $ 10,353
Held-to-maturity 8,268 8,867
Total investment securities 18,617 19,220
Gross unrealized gains    
Available-for-sale 1 22
Held-to-maturity 1 111
Total investment securities 2 133
Gross unrealized losses    
Available-for-sale 1,564 1,168
Held-to-maturity 413 38
Total investment securities 1,977 1,206
Estimated fair value    
Available-for-sale 8,786 9,207
Held-to-maturity, estimated fair value 7,856 8,940
Total investment securities 16,642 18,147
U.S. Treasury securities    
Amortized cost    
Available-for-sale 2,292 1,500
Gross unrealized gains    
Available-for-sale 0 17
Gross unrealized losses    
Available-for-sale 227 106
Estimated fair value    
Available-for-sale 2,065 1,411
Agency securities    
Amortized cost    
Available-for-sale 260 313
Held-to-maturity 127 137
Gross unrealized gains    
Available-for-sale 0 0
Held-to-maturity 0 0
Gross unrealized losses    
Available-for-sale 22 15
Held-to-maturity 6 3
Estimated fair value    
Available-for-sale 238 298
Held-to-maturity, estimated fair value 121 134
Agency guaranteed mortgage-backed securities    
Amortized cost    
Available-for-sale 6,631 7,207
Held-to-maturity 7,904 8,459
Gross unrealized gains    
Available-for-sale 1 5
Held-to-maturity 1 111
Gross unrealized losses    
Available-for-sale 1,218 989
Held-to-maturity 394 25
Estimated fair value    
Available-for-sale 5,414 6,223
Held-to-maturity, estimated fair value 7,511 8,545
Small Business Administration loan-backed securities    
Amortized cost    
Available-for-sale 283 355
Gross unrealized gains    
Available-for-sale 0 0
Gross unrealized losses    
Available-for-sale 14 14
Estimated fair value    
Available-for-sale 269 341
Municipal securities    
Amortized cost    
Available-for-sale 858 953
Held-to-maturity 237 271
Gross unrealized gains    
Available-for-sale 0 0
Held-to-maturity 0 0
Gross unrealized losses    
Available-for-sale 83 44
Held-to-maturity 13 10
Estimated fair value    
Available-for-sale 775 909
Held-to-maturity, estimated fair value 224 261
Other debt securities    
Amortized cost    
Available-for-sale 25 25
Gross unrealized gains    
Available-for-sale 0 0
Gross unrealized losses    
Available-for-sale 0 0
Estimated fair value    
Available-for-sale 25 25
Available-for-sale, Unrealized Gains, Other | Maximum    
Gross unrealized gains    
Available-for-sale $ 1 $ 1